Effort justification is the tendency to value an outcome more when we put effort into achieving it. The value we assign can exceed what the outcome objectively deserves. The IKEA effect is a well-known example: people place a higher value on furniture they partly assembled themselves, regardless of how good the final product is. The idea grows out of Leon Festinger's theory of cognitive dissonance. When effort produces a disappointing result, the mind resolves the tension by raising its estimate of the result, so the work feels worthwhile.

Israeli reports also say the cabinet directed the military to prepare for a possible new attack on Iran.

Angkor, near Siem Reap in northern Cambodia, was the capital of the Khmer Empire, which ruled much of mainland Southeast Asia between roughly the 9th and 15th centuries. At its height the city spread across about 3,000 square kilometres, making it the largest pre-industrial city on Earth by area. Its growth depended on water: huge reservoirs called barays, along with canals and embankments, stored monsoon rain and carried it to rice fields. That system let farmers harvest more than once a year and fed a very large population through the dry season. The temple complex of Angkor Wat, built in the early 12th century, is the best-known monument and still stands at the heart of the park.